<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cartInfo,index) in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked == 1" @click="changeState(cartInfo.skuId,$event.target.checked)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{cartInfo.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum('minus',cartInfo,-1)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt" @change="changeNum('input',cartInfo,$event.target.value*1)">
            <a href="javascript:void(0)" class="plus" @click="changeNum('plus',cartInfo,1)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuNum * cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="delCartGoods(cartInfo.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked && cartInfoList.length > 0" @click="changeAllState">
        <span>全选</span>
      </div>
      <div class="option">
        <!-- 删除选中的商品 -->
        <a href="#none" @click="delChooseCartGoods">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import throttle from 'lodash/throttle'
import {mapGetters} from 'vuex'
  export default {
    name: 'ShopCart',
    mounted(){
      this.getData()
    },
    computed:{
      ...mapGetters('shopcart',['cartList']),
      // 购物车数据
      cartInfoList(){
        return this.cartList.cartInfoList || []
      },
      // 总价
      totalPrice(){
       return this.cartInfoList.reduce((pre,cur)=>{
          return pre + cur.skuNum * cur.skuPrice
        },0)
      },
      // 全选按钮是否选中
      isAllChecked(){
        return this.cartInfoList.every(item=>item.isChecked == '1')
      }
    },
    methods:{
      getData(){
        // 获取购物车数据
        this.$store.dispatch('shopcart/getCartList')
      },
      // 为了避免
      // 改变商品数量
     changeNum:throttle(async function(type,cartInfo,num){
        // 参数一：类型，参数二：购物车信息，参数三：数量 num形参:+ 变化量（1）  -变化量（-1）   input最终的个数（并不是变化量）
        switch(type){
          case 'plus':
            num = 1
            break;
          case 'minus':
            // 限制条件：商品数量不能小于1
           /*  if(cartInfo.skuNum < 1){
              num = 0
            }else{
              num = -1
            } */
           num = cartInfo.skuNum < 1 ? 0 : -1
            break;
            case 'input':
              // 特殊情况:输入框输入的不是数字,或者是负数
           /*    if(isNaN(num) || num < 1){
                num = 0
              }else{
                // 输入的数是小数的情况
                num = parseInt(num) - cartInfo.skuNum
              } */
             num = isNaN(num) || num < 1 ? 0 : parseInt(num) - cartInfo.skuNum
              break;
        }
         // 派发action改变商品数量      
        try{
          // 修改数据成功
          await this.$store.dispatch('detail/addCart',{skuId:cartInfo.skuId,skuNum:num})
          // 重新获取数据
          this.getData()
        }catch(e){
          alert(e.message)
        }
        
      },500),
      // 删除购物车商品
      async delCartGoods(skuId){
        try{
          // 删除数据成功
          await this.$store.dispatch('shopcart/delCartGoods',skuId)
          this.getData()
        }catch(e){
          alert(e.message)
        }
      },
      // 改变商品选中状态
     async changeState(skuId,state){
      // 参数1是选中那个商品，参数2是选中状态
      let isChecked = state ? '1' : '0'
      try{
         this.$store.dispatch('shopcart/updateCartGoods',{skuId,isChecked})
         this.getData()
      }catch(e){
        alert(e.message)
      }
      },
      // 删除选中的商品
     async delChooseCartGoods(){
       try{
       await this.$store.dispatch('shopcart/delChooseCartGoods')
       this.getData()
       }catch(e){
         alert(e.message)
       }
      },
      // 改变全选按钮状态
     async changeAllState(event){
        try{
          let isChecked = event.target.checked ? "1" : "0";   
         // 派发action改变全选按钮状态
         await this.$store.dispatch('shopcart/updateAllCartGoods',isChecked)
         this.getData()
        }catch(e){
          alert(e.message)
        }
      }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 20%;
          }

          .cart-list-con2 {
            width: 31%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con3 {
            width: 10%;

            .item-txt {
              text-align: center;
            }
          }

          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 16%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 11%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 9%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>